import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif'] = ['SimHei']
plt.rcParams['axes.unicode_minus'] = False
speed = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200]
distance = [0.5, 2.0, 4.4, 7.9, 12.3, 17.7, 24.1, 31.5, 39.9, 49.2, 59.5, 70.8, 83.1, 96.4, 110.7, 126.0, 142.2, 159.4, 177.6, 196.8]
plt.scatter(speed, distance)
plt.xlabel('车速 (km/h)')
plt.ylabel('制动距离 (m)')
plt.title('车速与制动距离关系散点图')
plt.show()